From fab97c7db68f24e5cc3c1cf753d3bd1819beef8f Mon Sep 17 00:00:00 2001
From: UncleBill <billbill290@gmail.com>
Date: Tue, 8 Aug 2023 14:59:18 +0800
Subject: [PATCH] perf: return early in around and buffer source (#4721)

---
 src/completion/native/around.ts | 9 +++++----
 src/completion/native/buffer.ts | 3 ++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/completion/native/around.ts b/src/completion/native/around.ts
index a49e84802bf..ec1538b7082 100644
--- a/src/completion/native/around.ts
+++ b/src/completion/native/around.ts
@@ -13,17 +13,18 @@ export class Around extends Source {
 
   public async doComplete(opt: CompleteOption, token: CancellationToken): Promise<CompleteResult<ExtendedCompleteItem>> {
     let { bufnr, input, word, linenr, triggerForInComplete } = opt
+    if (input.length === 0) return null
     let buf = this.keywords.getItem(bufnr)
+    if (!buf) return null
     await waitImmediate()
     if (!triggerForInComplete) this.noMatchWords = new Set()
-    if (input.length === 0 || !buf || token.isCancellationRequested) return null
+    if (token.isCancellationRequested) return null
     let iterable = buf.matchWords(linenr - 1)
     let items: Set<string> = new Set()
     let isIncomplete = await this.getResults([iterable], input, word, items, token)
     return {
-      isIncomplete, items: Array.from(items).map(s => {
-        return { word: s }
-      })
+      isIncomplete,
+      items: Array.from(items, word => ({ word }))
     }
   }
 }
diff --git a/src/completion/native/buffer.ts b/src/completion/native/buffer.ts
index d89a3d60091..ebd7cd91a40 100644
--- a/src/completion/native/buffer.ts
+++ b/src/completion/native/buffer.ts
@@ -17,9 +17,10 @@ export class Buffer extends Source {
 
   public async doComplete(opt: CompleteOption, token: CancellationToken): Promise<CompleteResult<ExtendedCompleteItem>> {
     let { bufnr, input, word, triggerForInComplete } = opt
+    if (input.length === 0) return null
     await waitImmediate()
     if (!triggerForInComplete) this.noMatchWords = new Set()
-    if (input.length === 0 || token.isCancellationRequested) return null
+    if (token.isCancellationRequested) return null
     let iterables: Iterable<string>[] = []
     for (let buf of this.keywords.items) {
       if (buf.bufnr === bufnr || (this.ignoreGitignore && buf.gitIgnored)) continue